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Most of the challenges and extra features are running on test basis. Meaning that a certain group of players (can be decided according to game progress, platform, country etc) only get the challenge. Unfortunately we cannot hand pick player out or into the test group.
To make sure if you're in the test group it's worth a try to reconnect the game to your Facebook or Kingdom account. Which it sounds like you have already done.. Also make sure that you keep your game app up to date in order to assure to get all of the available features to your device.
You can check this video out on how to update your game:http://to.king.com/4zGs
I know it's disappointing but not to worry, there's plenty of exciting things ahead!